单选题If the freeboard is less than 9 meters, we should rig（）.Aa gangwayBa pilot ladderCrope ladderDgangway combined with pilot ladder
单选题
If the freeboard is less than 9 meters, we should rig（）.
A
a gangway
B
a pilot ladder
C
rope ladder
D
gangway combined with pilot ladder
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解析：
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